locus 5 (fixed distance from line segment)
A moving point P is 3 units from a line segment. Move the point P to find out the locus of P.
Describe the locus of P.（提示：這個軌跡是一個單一類別的圖形嗎？還是由不同圖形組成？)
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Information: locus 5 (fixed distance from line segment)